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The Precision SMC Centering Device has comb shaped and precisely made
jaws 10 with non-abrasive surface. During the centering process, the jaws close
and center the component by inserting fingers 11 into the spacings between
leads. Any tolerance build up by each individual lead can be averaged to
achieve the best fit to the pad pattern on the PCB. The fingers 11 are tapered at
tip and widen gradually at bottom to provide for tolerance. If the lead is slightly
bent, the fingers 11 still get into the space between the leads and straighten the
bent lead. If the component lead is bent significantly, the finger 11 would not be
able to get into the space between leads. A sensor (not shown) detects that the
jaw 10 with comb shaped fingers 11 has not travelled the distance in the range
as specified in the program. The placement machine receives the feedback from
the sensor and rejects the component as a defec component with bent leads
before placing the component on the PCB.